html,body,#app{
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}
h1,h2,h3,h4,h5,h6,p{
    padding: 0;
    margin: 0;
}
ol,ul,li{
    list-style: none;
    margin: 0;
    padding: 0;
}
button{
    outline: none;
    border: none;
}
input{
    outline: none;
    border: none
}
a:link,a:visited,a:hover,a:active{
    text-decoration: none;
    color: #333;
}
.clearfix::after{
    content: "";
    clear: both;
    display: block;
}